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Note 8 - Financing Activities (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 16, 2025
Oct. 09, 2025
Aug. 19, 2025
Jul. 29, 2024
Jul. 26, 2024
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Jan. 29, 2025
Sep. 27, 2024
Dec. 31, 2023
Preferred Stock, Convertible, Shares Issuable             1,000   1,000          
Payments for Repurchase of Warrants     $ 525,000           $ 1,989,000 $ (0)        
Class of Warrant or Right, Cancelled During Period                 1,988,283          
Deemed Capital Contribution pursuant to Series F Agreements                 $ 433,000 $ 0        
Class of Warrant or Right, Issued During Period (in shares)                 0 28,572        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)             $ 66.61 $ 56.63 $ 66.61 $ 56.63 $ 1.41     $ 50.96
Class of Warrant or Right, Exercised During Period (in shares)                 (1,119,908) (0)        
Modification of Warrants                 $ 0 $ 69,000        
The 2024 Warrant Reprice Transaction [Member]                            
Debt Issuance Costs, Gross               $ 96,000   96,000        
Existing Warrants [Member]                            
Class of Warrant or Right, Cancelled During Period     1,988,283                      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)             2.5   $ 2.5          
Class of Warrant or Right, Exercised During Period (in shares)           90,381                
Proceeds from Warrant Exercises           $ 200,000                
Prefunded Warrants 2024 Public Offering [Member]                            
Class of Warrant or Right, Issued During Period (in shares)         2,041,814                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 0.01               $ 0.66  
Class of Warrant or Right, Exercise Price, Percentage of Volume Weighted Average Prices         90.00%                  
Class of Warrant or Right, Exercise Price, Trading Days         5 days                  
Series F-1 Warrants [Member]                            
Class of Warrant or Right, Issued During Period (in shares)         3,200,380                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         3,200,380                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 1.1   0.66   0.66          
Warrants and Rights Outstanding, Term (Year)         5 years                  
Series F-2 Warrants [Member]                            
Class of Warrant or Right, Issued During Period (in shares)         3,200,380                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         3,200,380                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 1.1                  
Warrants and Rights Outstanding, Term (Year)                       6 months    
Series F-3 Warrants [Member]                            
Class of Warrant or Right, Issued During Period (in shares)         3,200,380                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         3,200,380                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 1.1                  
Warrants and Rights Outstanding, Term (Year)         1 year                  
Class of Warrant or Right, Exercised During Period (in shares)                     527,784      
June 2024 Warrant [Member]                            
Class of Warrant or Right, Cancelled During Period     9,071                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)           90,381                
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 2.57 $ 2.57   $ 2.57          
Warrants and Rights Outstanding, Term (Year)             5 years   5 years          
The 2024 Warrant Reprice Transaction [Member]                            
Modification of Warrants             $ (69,000) $ (69,000)            
2025 Preferred Stock Purchase Agreement [Member] | Subsequent Event [Member]                            
Preferred Stock, Convertible, Shares Issuable   43,000,000                        
The 2024 Public Offering [Member]                            
Stock Issued During Period, Shares, New Issues         1,158,566                  
Maximum Percentage of Common Stock Outstanding         4.99%                  
Proceeds from Issuance of Stock and Warrants       $ 3,900,000                    
The 2024 Public Offering [Member] | Election of the holder prior to the date of issuance [Member]                            
Maximum Percentage of Common Stock Outstanding         9.99%                  
Over-Allotment Option [Member] | Underwriter From 2024 Public Offering [Member]                            
Stock Issued During Period, Shares, New Issues       336,832                    
Over-Allotment Option [Member] | Maximum Amount Purchasable By Underwriter [Member] | Underwriter From 2024 Public Offering [Member]                            
Stock Issued During Period, Shares, New Issues         477,272                  
Option Period         45 days                  
Over-Allotment Option [Member] | Series F-1 Warrants [Member] | Underwriter From 2024 Public Offering [Member]                            
Class of Warrant or Right, Issued During Period (in shares)       336,832                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       336,832                    
Over-Allotment Option [Member] | Series F-1 Warrants [Member] | Maximum Amount Purchasable By Underwriter [Member] | Underwriter From 2024 Public Offering [Member]                            
Class of Warrant or Right, Issued During Period (in shares)         477,272                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         477,272                  
Over-Allotment Option [Member] | Series F-2 Warrants [Member] | Underwriter From 2024 Public Offering [Member]                            
Class of Warrant or Right, Issued During Period (in shares)       336,832                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       336,832                    
Over-Allotment Option [Member] | Series F-2 Warrants [Member] | Maximum Amount Purchasable By Underwriter [Member] | Underwriter From 2024 Public Offering [Member]                            
Class of Warrant or Right, Issued During Period (in shares)         477,272                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         477,272                  
Over-Allotment Option [Member] | Series F-3 Warrants [Member] | Underwriter From 2024 Public Offering [Member]                            
Class of Warrant or Right, Issued During Period (in shares)       336,832                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)       336,832                    
Over-Allotment Option [Member] | Series F-3 Warrants [Member] | Maximum Amount Purchasable By Underwriter [Member] | Underwriter From 2024 Public Offering [Member]                            
Class of Warrant or Right, Issued During Period (in shares)         477,272                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         477,272                  
Series D Preferred Stock [Member]                            
Stock Issued During Period, Value, New Issues             3,786,000              
Proceeds from Issuance of Preferred Stock and Preference Stock                 $ 3,786,000 0        
Series D Preferred Stock [Member] | 2025 Preferred Stock Purchase Agreement [Member]                            
Stock Issued During Period, Shares, New Issues     481,250                      
Preferred Stock, Convertible, Shares Issuable     77,000,000                      
Stock Issued During Period, Value, New Issues     $ 3,850,000                      
Series D Preferred Stock [Member] | Initial Series D Preferred Purchase [Member]                            
Stock Issued During Period, Shares, New Issues     481,250                      
Shares Issued, Price Per Share (in dollars per share)     $ 8                      
Proceeds from Issuance of Preferred Stock and Preference Stock     $ 3,850,000                      
Proceeds from Issuance of Preferred Stock and Preference Stock, Net     3,790,000                      
Payments of Stock Issuance Costs     $ 64,000                      
Series E Preferred Stock [Member] | Subsequent Event [Member]                            
Stock Issued During Period, Shares, New Issues 268,750                          
Shares Issued, Price Per Share (in dollars per share) $ 8                          
Proceeds from Issuance of Preferred Stock and Preference Stock $ 2,150,000                          
Series E Preferred Stock [Member] | 2025 Preferred Stock Purchase Agreement [Member]                            
Stock Issued During Period, Shares, New Issues     268,750                      
Preferred Stock, Convertible, Shares Issuable     43,000,000                      
Stock Issued During Period, Value, New Issues     $ 2,150,000                      
Series E Preferred Stock [Member] | 2025 Preferred Stock Purchase Agreement [Member] | Subsequent Event [Member]                            
Stock Issued During Period, Shares, New Issues 268,750 268,750                        
Proceeds from Issuance of Preferred Stock and Preference Stock   $ 2,200,000                        
Series F Preferred Stock [Member]                            
Stock Issued During Period, Shares, New Issues     1,986,565                      
Stock Issued During Period, Value, New Issues                 1,484,000 0        
Payments of Stock Issuance Costs                 $ 527,000 $ (0)        
Deemed Capital Contribution pursuant to Series F Agreements     $ 433,000       $ 433,000              
Series F Preferred Stock [Member] | Minimum [Member]                            
Maximum Percentage of Common Stock Outstanding     6.30%                      
Series F Preferred Stock [Member] | Maximum [Member]                            
Maximum Percentage of Common Stock Outstanding     12.70%